Variable-resistance, electromagnetic drilling machinery.



H SYMES.

VARIABLE RESISTANCE, ELECTROMAGNETIC DRILLING IIACHINERY.

APPLICATION mm MAY 2a. 1915.

1,21 9,190. Patented Mar. 13, 1917 r' ma "UNITED STATES ATENT OFFICE.

HENRY SYMES, or moannvo'ron, NEAn DUNEDIN, NEW ZEALAND VARIABLE-RESISTANCE, ELECTROMAGNETIC DRILL ENG MACHINERY.

1 215L190. Specification of Letters Patent.

Application filed May 26, 1815. Serial No. 30,6 {7.

TonlMv/w'mtimay concern: 'or key C to alow of the drill]; ascendlie it known that I, llannr SrMns, of ing or descending. D are gear heels .\lm-nington, subject of His Majesty I the but obviously any: other suitabl "W King of Great Britain, residing at orngear could be useli E E is a dou bl elctrd' ington, near the city of Du'nedin, in the magnet actuated by the electrical current;

British Dominion of New Zealand, inventhrough-E F F is the solenoid capable tor, have invented certain new and useful of drawing in the drill spindler-byg-yoke on Improvements in variable Resistance, Elec- Q in the Jdirecti )n of the arrowi ifland'so tromagnetic, Drilling Machinery, of which drillin The electrical current passing the following is a specification. throng the wires FfiF and the variable The object of this invention is to furnish resistance device F and E" show these a portable drilling set that is operated by devices whicluwo uld beincluded in all mm a branch taken off the usual high power rents as mentioned. G is the usual electrielectrical current carrying'cablcs, .or other cal drilling motor fed by variable resistance .1 ntcntcd Mar. 13, 191.7.

electrical supply sufficiently powerful for the pu use, also to show nfit'ns whereby,

the driling set is kept to its work by elec'- ply tromagnetic means, causing the drilling frame to adhere to the metal surface to be drilled; thus doing away wi he knees, cramps or chain devices now necessary to kee the drill pressed to th Work to be dri led. r H

The drill itself may be worked by hand or flexible shaft or other suitable powerinstead of electricity if desired, and fedto its work either by hand or automatically in the usual way, or drawn down to its workby a solenoid, all electrical currents being supplied with a variable resistance device so as to lessen the power when same could be done, thus obviating the heatin that would result from, a continuous higi power electrical current passing through the various cables and obbins. Where the drill is worked forward by a solenoid, a trip would be provided lessening the power and closing it off as the hole was about through, or deep enough. The accompanying drawing illustrates an elevation of a variable resistance electro- 'magnetic drilling machine embodying-the i features of the invention.

The machine comprlses a frame A pro vided with a yoke A having members A A represents the device or article to be drilled.

B is a drill of any usual .make fixed to C the usual drilling spindle and holder which engages the frame A and yoke A. The spindle or holder, has a sliding feather when desired.-

electricity at G. I

As my ob'ect in this invention is to apa warm le lesistance current of electi-lcity to electro magnets to cause the drilling frame to adhere to the metal work to be drilled, and also to feed as well-as drive the drill by the'same currents,a-ll capable of alteration in intensity, as needed, the

frame is immaterial exact form of dlllllll but I have set forth suitableonesj-f purposes. The switching .on-andfoflvarious currents or branches would be in the usual manner and so as to be independent of each other. suitable material: or sizes may be adopte Having descril ed and explained my in- 1 vention wllat I d :sire to obtain in a patent of the United Sta tes of America, is y 1. In electro-magnetic drillin machinery, the combination of a frame li avingweix. tremities forming solenoids, a drill,

' rotatably mounted In the frame an up videcl with operating means, electro-niags nets iipplied over the solenoids the solenoids prqecting-beyphd the 16!) ma nets to provide attractive gm tiv y to the worir to holdthe- 'd ril chinery in place, and means for variable resistance current through sc lenoids to set-up a direct pullby'means-ofbeing operable tc 2. In electro nagnetic'drilliii er the combination o'f-. a 0 e members forming soled" Q agnets engngin g 1 sa d solen p e O lessen the pews thereof I In this invention an? r t the latter, the variableresistance" etirrent spindle l'fltfllilbl" and slidnbly HHIHIHW in relation Ln Hm frnmv (nu-lying the drill, the solenoids JUN] 1116 01001roqmuznuts llwrvnf operating to draw the spindlv mul (ll'ill clo sely to the work, an electric mntm' Con hauled to uni operating the drill. spimllu v and means for feiading a variable resistance uurrout through 11n- Snh-nnids h) set up n dmw! puH by mums ui' [I10 latter, the said vzu'mhlv rvslslunw vm rvni being reducible 10 to uln'iute hunting.

In testimony \vlwl'vof I have llol'euntu set YMES.

my hand.

H ENRY 

